Year Percent Change From Preceding Period 2004-01-01 4.47787532536286 2005-01-01 8.66480871548011 2006-01-01 6.25242869355716 2007-01-01 4.10822782145851 2008-01-01 5.79999174176626 2009-01-01 2.96195085925207 2010-01-01 8.44628157730225 2011-01-01 6.62692211702141 2012-01-01 6.45267237934658 2013-01-01 5.79270702404163 2014-01-01 4.32653469241175 2015-01-01 3.89466823388838 2016-01-01 5.91499873763693 2017-01-01 6.42410368928364 2018-01-01 5.85488873084028 2019-01-01 6.02987957337277